Two formats are available: .raw and .tga (32bit/pixel not compressed).
Your line is correct, I tested it myself.
There is no Alpha layer, only Alpha channel. .tga files have this channel by default (if they have 32bit/pixel).
When .raw file is being used, Mod Manager automatically searches for a.raw file and gets Alpha channel information out of it.
And yes, the Mod Manager properly loads 2x size textures

may the problem is... i'm a noob, i'm using windows 8.1 and i have installed the fan patch 1.41

yesterday the mods worked whit mod mannager, green fire ball, hr textures and the color changer did work, but texture multiplier didn't work... and yes i modify the folder permissions and i modified "//" in .txt to activate mod...

i had a problem and i reinstalled the game from zero, but today only work if i extract the mod manager.zip in the game folder, but if i modify some line about any .txt file, the game or crashes or run whitout textures and all is dark red colored....

i wanna to try more but i don't know if i give up....
Can i work in virtualbox no?

PD: do you have any modified textures? or more resolution or something can i install to see it? you are a f*** genius.
I started whit this, cause nostalgy and because i modified a .txt info in playgrounds folder, and i felt god XD but now i feel shit hahaha.

The problem with everything being with dark red colors seems to be the same as in the http://bawsite.com/forum/showthread.php?tid=2. For some reason I don't have it, and neither has Lant.
It seemed random for Padepad, though.
Are you sure you can reliably avoid it by using the default files, and reliably cause it by changing them? If so, a copy of such a modified file may help me to find what causes the problem.

I am not sure about VirtualBox, but the game can work in VMware, and so can BaW Graphics Mod Manager.

You can get textures from, for example, https://cc0textures.com/. You need to convert them to 32 bits per pixel TGA, though. Direct3D 7 may be limited to 2048 x 2048 textures.

i found the main problem... i modify some .raw textures an they make the red bug, but whit the original textures the problem is fix and mod mannager works. (multiplier textures doesn't work)

If i try lunch B&W only patched with 1.10, 1.20, and 1.30 but doesn't run (in windows 8.1) only run if i have instelled 1.41 and i fix "runblak.exe" whit the patch i fond i this page... so maybe i can do nothing...
to edit textures i use photoshop 2014 to create .tga files, and only i tried 512x512.. but nothing

Can you send me those .raw textures? Perhaps they'd cause the problem for me, too, allowing me to find the source of the problem.
The Texture Repeat mod would try to use the Sky.raw, smallbump.raw and burn.raw files to detect the textures, perhaps the changes you made to the .raw files prevent it from working.
You don't have to install 1.10 and 1.20 separately. 1.30 is enough. Just make sure to use a crack. You can get it here: http://web.archive.org/web/2012070318585...ostnum=890
Try to upload your .tga file.